Here is another link of Susan Brown's explaining Potassium's role in bone health:

http://www.betterbones.com/category/pH-and-Bone.aspx

It is important to keep in mind that some drugs used by people with chronic illnesses actually cause acidosis and/or bone loss.
These two cause metabolic acidosis:
Topamax
Metformin (Glucophage)

And diuretics typically deplete potassium and magnesium.
Steroids deplete potassium. Steroids in general cause osteoporosis or bone loss.

Anticonvulsants cause osteopenia/osteoporosis.

Low Vit D levels

Low B12 levels

Low Vit K levels... all 3 implicated in bone loss.

Bones are complicated!